Jung, Jinsang and Kim, Young J. and Aggarwal, Shankar Gopala and Kawamura, Kimitaka (2011) Hygroscopic property of water-soluble organic-enriched aerosols in Ulaanbaatar, Mongolia during the cold winter of 2007. Atmospheric Environment, 45 (16). pp. 2722-2729. ISSN 1352-2310

PDF - Published Version Restricted to Registered users only Download (656Kb) | Request a copy

Abstract

The hygroscopic properties of the water-soluble matter extracts of atmospheric aerosols collected at an urban site (47.92° N, 106.90° E, ∼1300 m above sea level) in Ulaanbaatar, Mongolia during the cold winter of 2007 were investigated using a hygroscopicity tandem differential mobility analyzer (H-TDMA). Dynamic shape correction factor (χ), the ratio of the actual drag force on a non-spherical aerosol particle to that on a sphere of equivalent volume, of the laboratory generated water-soluble matter (WSM) was found to be 1.09–1.38 (avg. 1.23 ± 0.10), implying that particles generated from the WSM are highly non-spherical. The reduction in the mobility diameter can cause ∼11% underestimation in a hygroscopic growth factor at 85% RH. The hygroscopic growth factors at 85% RH (g(85%)), defined as the ratio of the particle diameter at 85% RH to that at RH < 10% (initial dry diameter), of the WSM (initial dry particle diameter = 100 nm) were 1.32–1.50 (avg. 1.40 ± 0.06). The g(RH) of the water-soluble organic matter (WSOM) was retrieved from the measured g(RH) of the WSM and using the ZSR (Zdanovskii–Stokes–Robinson) approach and the thermodynamic aerosol inorganic model (AIM). We found that the g(85%) of the WSOM were in the range of 1.11–1.35 (avg. 1.22 ± 0.08), which are comparable to those of the biomass burning aerosols.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Water-soluble organic aerosol; Hygroscopicity tandem differential mobility analyzer; Ulaanbaatar; Hygroscopic growth factor
Subjects:	Meteorology & Atmospheric Sciences > Environmental Contamination and Toxicology > Environmental Contamination and Toxicology > Environmental Contamination and Toxicology > Environmental Contamination and Toxicology
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	03 Jan 2013 10:11
Last Modified:	03 Jan 2013 10:11
URI:	http://npl.csircentral.net/id/eprint/940

Actions (login required)

View Item